Parking up at Greenhithe and walking back down, you hit Black Duck first. This area consists of a long open grassland stretch, with small mudflats on the Thames side and an extensive reedbed on the other. As you would expect, there is the usual assortment of waders, with Oystercatchers and Turnstones making up the majority, alongside Gulls and Cormorants.
Swallows and House Martins nest in the Ingress Park housing estate over summer and can be seen whizzing around the area, occasionally dropping down to feed alongside the Wagtails on the riverfront.
At the edge of the reedbed a small pond is located as the plants open up, where I found a large ensemble of Marsh Frogs happily singing away. The usual bird life, including warblers, gulls and herons can be seen, and Water Rails scurry about. These shy birds are quite similar to Moorhens and Coots but give themselves away with a truly blood-curdling call, a lot like a startled pig squeal. I didn't manage to spot him but the sound is unlike anything else and could only have been one thing.
A group of Ravens have also taken up residence, and can be seen patrolling from the power pylons, much to the displeasure of the local Lapwing population. Although I do see a fair few Ravens here in winter, having them nest in the area is still relatively rare.
One thing immediately noticeable on this site is the amount of refugia laid out for reptiles, the place is literally covered. Some of them are perhaps a little too out in the sun, and even by 9-30am they were crazy-hot to touch. I'm definitely thinking of taking an evening trip to see if more can be found as the sun starts to dip, and these mats are cooler and hence more tolerable for the animals I'm hoping to find, along with the chances of spotting some roosting birds and hunting owls, but that's a trip for another day.
I did have some joy, with two Grass Snakes and a few Viviparous Lizards on Wednesday's visit, and several lizards on Thursday's slightly earlier walk. Due to how hot they were getting the previous day I figured trying my luck about an hour earlier would yield better results the next day, but heavy cloud until about half 8 ruined any chances of catching them out basking. I'll likely leave it at least one or two weeks before trying again so as not to disturb them too much.
UK Grass Snakes were recently reclassified as Western Barred Grass Snakes, there was a fair bit of confusion surrounding this and it was widely reported as a fourth UK species. However, they were simply upgraded from a subspecies of Natrix Natrix (as they were previously known) to a full species (Natrix Helvetica) in their own right, and it got lost in translation. Apparently there are a few locations where the darker mainland variety can be found, but these are escapees or otherwise introduced, or simply misidentified due to the variable nature of the markings.
These guys are totally harmless, and if you pick them up are likely to struggle and squirm before settling down, but they simply do not bite. They will emit an absolutely fowl smelling musk from their cloaca as a defence mechanism though, if you've ever experienced it then you will know just how bad it is! To be fair, if you are a fox or similar and you grab one, and it musks in your mouth, you are definitely dropping it, and then they're off like a shot! Occasionally they will also play dead as a last resort, rolling over whilst gaping their mouths and hanging their tongues out, as some of their predators will only take live prey.
There's been a lot of talk over the last few years about converting this site to a new amusement park, and leaving aside the traffic issues it will create in an already congested area, we should all be doing what we can to stop this and preserving the great wildlife of this hidden gem, like the Reed Warbler pictured above, who seemed to follow me around Botany for most of the morning.
As ever, I'll choose my favourite photo of the trip, this time I'm going with this yearling Grass Snake (modelled by the missus before you question my choices in nail polish 😂). He did his best to act tough and scare us off but if anything just made himself more cute!
Thanks for reading, until the next one!



